Radioshack taught me there’s literally tens of thousands, if not millions of connectors used in EE. I’d say, find an electronics shop of some kind and start there.
That thing, looks kind of like one of the connectors for a 1980s “backpacking CB radio” we sold a connector kit for when I worked at the rat shack. The thing was mostly BNC connectors, but there was a two-prong thingy for connecting to your 48v SLC battery pack.
